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What is the expression for the thermal conduction resistance to heat transfer through a hollow sphere of inner radius r1 and outer radius r2 , and thermal conductivity K?               (IES-07)

(a)$\tfrac{r_2-r_1*(r_1r_2)}{4\pi k }$

(b)$\tfrac{(r_2-r_1)4\pi k}{r_1*r_2}$

(c)$\frac{r_2-r_1}{4\pi k(r_1*r_2)}$

(d) None of these<!--[if gte msEquation 12]>None nof these<![endif]-->

 

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